Locking device



FIG. 1 is a view in perspective at an angle from the front, top and right-hand side of the locking device showing the new design;

FIG. 2 is a front view of the locking device;

FIG. 3 is a rear view of the locking device;

FIG. 4 is a view of the left-hand side of the locking device;

FIG. 5 is a view of the right-hand side of the locking device;

FIG. 6 is a top view of the locking device; and,

FIG. 7 is a bottom view of the locking device.

The broken lines illustrate unclaimed portions and form no part of the claimed design. 

CLAIM The ornamental design for a locking device, as shown and described. 